01-21-2013
the line +/- buffers/cache basically shows the memory used and free without taking into account how much is used for buffers or cache.
This is because cached memory is not actually used memory, it is information that is stored for quick retrieval if requested again from previous operations but dumped straight away if memory is required to be written to. This process makes the system run quicker as queries are using data stored on RAM instead of hard disk which is obviously a much quicker process.
So yes, top line free + cached = free on 2nd line
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